Compilare: user.cpp: In function ‘void make_aint(std::vector<int>&, int)’: user.cpp:49:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<L.size();i++) ^ user.cpp: In function ‘int dfs(int, int, int)’: user.cpp:58:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<V[nod].size();i++) ^ user.cpp:84:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<V[nod].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:122:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("heavypath.in","r",stdin); ^ user.cpp:124:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:128:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&val[i]); ^ user.cpp:132:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^ user.cpp:144:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&t,&x,&y); ^